While earlier apps that did this worked wirelessly (convenient, but laggy and compressed), Duet Display works over the cable, whether Lightning or 30-pin, with full support for Retina and touch. However, you can turn an iPhone or iPad into a second display for your Mac or PC with this app, which earns it a spot in our list of the best iPad apps for designers. It's not always convenient, though – maybe you're rushing to hit a deadline in an airport departure lounge, or you're hotdesking in a co-working space. One of the easiest ways to be more productive as a designer is to add more screens to your computer, so you can have source material on one while working on the main display, keep an eye on email (or Slack!) while you work without switching between tasks, or just as somewhere to put your palettes so you're not covering up your work. Price: $9.99 (opens in new tab)/ £9.99 (opens in new tab).Turn your iPad into a second display and become more productive Basically: if you wanna hit deadlines for big projects, get this app. Everything is live and shared, and it will help you resolve scheduling impossibilities. With OmniPlan, you can create Gantt charts to allocate time and resources to specific parts of a project, and because each part is interrelated, you can keep focused on what the material effects will be of the wireframing process, say, taking longer than you had anticipated. While we've rejected The Omni Group's to-do app for being a little too complex for the kind of to-dos we creatives want to track, it's precisely that complexity that makes its project planning app a must-have – though only for big projects, and only for senior folk (if you're self-employed, mind you, or work in a very small team, guess what? You're the senior folk). Price: $99.99 (opens in new tab)/ £99.99 (opens in new tab) (Free trial available).Big projects come together a lot easier with OmniFocus (Image credit: The Omni Group)

Best drawing software for ipad